One of the model’s closest friends, Margot Robbie, was visibly upset this week, shortly after leaving Cara’s LA home. Sources with direct knowledge tell TMZ there’s a good reason Margot’s emotions ran high that day. We’re told Cara has been struggling for a while, initially with mental health issues, but now those closest to her believe she needs rehab as well. We’re told Margot and other friends are advocating that Cara immediately enter a treatment program that includes psychotherapy as well as substance abuse treatment. You may recall, Cara and Margot went on vacation together back in August … traveling to Spain with other friends to celebrate Cara’s 30th birthday, and since then she’s been appearing increasingly erratic in public. Play video content 9/6/22 BACKGRID Last week, she looked completely disheveled and looked confused after initially boarding one of Jay-Z’s private jets in Los Angeles. The flight never took off and she disembarked 45 minutes later. The day Margot went to visit Cara … she was supposed to be at her own New York Fashion Week event. It never made it to New York. Our sources tell us Cara isn’t closing the door on getting treatment — she didn’t just say no, but she’s dragging her feet … and we’re told her struggles are getting worse.